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发明名称
Method of making findings for pin stems
摘要
申请公布号
US2221429(A)
申请公布日期
1940.11.12
申请号
US19390270887
申请日期
1939.04.29
申请人
B. A. BALLOU & CO., INC.
发明人
MOREHOUSE EUGENE
分类号
B21D53/00
主分类号
B21D53/00
代理机构
代理人
主权项
地址
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